Heat sink



FIG. 1 is a perspective view of the top of a heat sink showing my new design;

FIG. 2 is a perspective view of the bottom of the heat sink of FIG. 1;

FIG. 3 is a front elevational view thereof, the rear view being a mirror image;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a cross-sectional view thereof, taken on line 8--8 of FIG. 5;

FIG. 9 is an enlarged top fragment view of the pin and pin base taken of FIG. 5; and,

FIG. 10 is an enlarged front elevation fragment view of the pin and pin base of FIG. 9; the rear and side elevational views being the same. 

The ornamental design for a heat sink, as shown and described. 